Communication method and apparatus

Abstract

A communication method and apparatus. The communication method comprises: receiving a first primary synchronization signal (PSS) corresponding to a first cell set, wherein the first cell set comprises a first cell and a second cell; and determining to move from the second cell to the first cell, and sending an access request, wherein the access request is used for accessing the first cell, the access request is associated with a first identifier, and the first identifier is used for identifying a terminal device in the first cell set. By means of the method, when moving within a first cell set, a terminal device only needs to receive a dedicated PSS for lightweight downlink synchronization, and then implements uplink synchronization by means of a dedicated identifier, thereby improving the communication efficiency. In addition, cells or sub-areas of the first cell set share the same dedicated identifier resource, thereby avoiding the need for a terminal to reconfigure an identifier resource each time the terminal moves, and avoiding a waste of communication resources.

Description

Communication methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202410985563.4, filed on July 22, 2024, entitled "Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of communication technology, and in particular to a communication method and apparatus. Background Technology

[0003] New Radio (NR) initial access includes downlink synchronization and uplink random access. In downlink synchronization, the base station sends a synchronization signal block (SSB). The user equipment (UE) synchronizes according to the primary synchronization signal (PSS) and secondary synchronization signal (SSS) in the SSB, and receives the master information block (MIB) and system information block (SIB) messages to determine the cell identifier and uplink random access time-frequency resources and sequence set. In uplink random access, taking a 4-step random access as an example, the UE sends a random access (RA) preamble, the base station sends a random access response (RA Response) to provide timing advance (TA), the UE adjusts the timing and sends the user identifier, and the base station provides conflict resolution feedback. If the UE moves from one cell to another, it needs to complete the above initial access process again and reacquire the TA, resulting in low communication efficiency. Summary of the Invention

[0004] This application provides a communication method that helps improve communication efficiency and avoid waste of communication resources.

[0005] In a first aspect, embodiments of this application provide a communication method that can be applied to a terminal device, such as a terminal or a communication module within a terminal, or a circuit or chip in the terminal responsible for communication functions (such as a modem chip, also known as a baseband chip, or a system-on-a-chip (SoC) chip containing a modem core, or a system-in-package (SIP) chip). Taking the application of this method to a terminal device as an example, the method includes:

[0006] Receive the first primary synchronization signal (PSS) corresponding to the first cell set, the first cell set including the first cell and the second cell;

[0007] The device determines that it is moving from the second cell to the first cell and sends an access request to access the first cell. The access request is associated with a first identifier, which is used to identify the terminal device in the first cell set.

[0008] Using the above method, when the terminal device moves within the first cell set, it only needs to receive a dedicated PSS for lightweight downlink synchronization and then use a dedicated identifier to achieve uplink synchronization, thereby improving communication efficiency. Furthermore, the cells or sub-areas of the first cell set share the same dedicated identifier resources, avoiding the need to reconfigure identifier resources every time the terminal moves, thus avoiding waste of communication resources.

[0009] In one possible design, determining that the terminal device moves from a third cell to a fourth cell, or, in response to the terminal device first accessing the fourth cell, the method further includes: receiving the first identifier, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell within the first cell set.

[0010] In one possible design, the access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

[0011] In one possible design, the method further includes:

[0012] Determine the first preamble.

[0013] In one possible design, the first preamble corresponds one-to-one with the first identifier;

[0014] The first preamble, associated with the first identifier and the current time unit, satisfies the following formula:

[0015] in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

[0016] Using the above method, the preamble is frequency-hopping over time, which avoids the conflict of dedicated random access preambles in different dedicated transmission areas. It can be uniquely determined based on the dedicated UE ID, without the need for radio resource control (RRC) signaling to indicate the dedicated random access preamble ID.

[0017] In one possible design, the sequence of the first preamble satisfies the following formula:

[0018] Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

[0019] Using the above method, the dedicated RA preamble sequence within the same first cell set uses the same cubic term coefficient, while different linear and quadratic term coefficients are used to distinguish terminal devices accessing the first cell set. This avoids conflicts between terminals in different first cell sets, enabling one-time configuration for long-term use, reducing the number of times network devices need to configure RA preambles for terminal devices, and saving communication resources.

[0020] In one possible design, the data format of the access request indicates the SSB index corresponding to the first cell.

[0021] In one possible design, the method further includes: acquiring time-frequency resources, the time-frequency resources being used by the terminal device to access cells in the first cell set;

[0022] The sending of the access request includes:

[0023] The access request is sent using the time-frequency resources.

[0024] Using the above method, data transmission between the terminal device and the first cell set can be achieved through dedicated time and frequency resources, avoiding the occupation of other time and frequency resources and improving communication efficiency.

[0025] Secondly, embodiments of this application also provide a communication method, which can be applied to network devices, such as access network devices or components (e.g., circuits, chips, or chip systems) within access network devices. Taking the application of this method to an access network device as an example, the method includes:

[0026] Send a first primary synchronization signal (PSS) corresponding to a first set of cells, the first set of cells including a first cell and a second cell;

[0027] A request is received to access the first cell. The access request is associated with a first identifier, which is used to identify the terminal device in the first cell set.

[0028] Using the above method, when the terminal device moves within the first cell set, it only needs to receive a dedicated PSS for lightweight downlink synchronization and then use a dedicated identifier to achieve uplink synchronization, thereby improving communication efficiency. Furthermore, the cells or sub-areas of the first cell set share the same dedicated identifier resources, avoiding the need to reconfigure identifier resources every time the terminal moves, thus avoiding waste of communication resources.

[0029] Thirdly, embodiments of this application also provide a communication method, which can be applied to a terminal device, such as a terminal or a communication module in the terminal, or a circuit or chip in the terminal responsible for communication functions (such as a modem chip, also known as a baseband chip, or a SoC chip or SIP chip containing a modem core). Taking the application of this method to a terminal device as an example, the method includes: receiving a synchronization signal block (SSB) corresponding to a fourth cell; determining that the device has moved from a third cell to a fourth cell, or, in response to the terminal device first accessing the fourth cell, receiving a first identifier, wherein the third cell is a cell outside the first cell set, the fourth cell is a cell within the first cell set, and the first identifier is used to identify the terminal device in the first cell set.

[0030] In one possible design, the method further includes: receiving a first primary synchronization signal (PSS) corresponding to the first cell set, the first cell set including a first cell and a second cell; determining that the user is moving from the second cell to the first cell; and sending an access request for accessing the first cell, the access request being associated with the first identifier.

[0031] In one possible design, the access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

[0032] In one possible design, the method further includes: determining the first preamble.

[0033] In one possible design, the first preamble is associated with the first identifier, including: the first preamble and the first identifier have a one-to-one correspondence;

[0034] The first preamble, associated with the first identifier and the current time unit, satisfies the following formula:

[0035] in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

[0036] In one possible design, the sequence of the first preamble satisfies the following formula:

[0037] Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

[0038] In one possible design, the data format of the access request indicates the SSB index corresponding to the first cell.

[0039] In one possible design, the method further includes: acquiring the time-frequency resources, the time-frequency resources being used by the terminal device to access a cell in the first cell set; the sending of the access request includes: sending the access request through the time-frequency resources.

[0040] Fourthly, embodiments of this application also provide a communication method, which can be applied to network devices, such as access network devices or components (e.g., circuits, chips, or chip systems) in access network devices. Taking the application of this method to an access network device as an example, the method includes: sending a synchronization signal block (SSB) corresponding to a fourth cell; sending a first identifier, wherein the first identifier is used to identify the terminal device in the first cell set, and the fourth cell is a cell within the first cell set.

[0041] Fifthly, at least one embodiment of this application also provides a communication device disposed in a terminal device. In one possible design, the communication device may include modules, units, or means corresponding to each of the methods / operations / steps / actions described in the first aspect. These modules, units, or means may be hardware circuits, software, or a combination of hardware circuits and software. The operations performed by this communication device and its beneficial effects can be found in the methods and beneficial effects described in the first aspect above.

[0042] In one possible design, the communication device includes a processing unit and a transceiver unit. The transceiver unit is configured to receive a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell. The transceiver unit is further configured to determine that the device is moving from the second cell to the first cell and to send an access request for accessing the first cell. The access request is associated with a first identifier, the first identifier being used to identify the terminal device in the first cell set.

[0043] The processing unit is used for all operations other than the sending and receiving operations performed by the terminal device described in the first aspect.

[0044] In one possible design, the transceiver unit is further configured to: receive the first identifier, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell within the first cell set.

[0045] In one possible design, the access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

[0046] In one possible design, the processing unit is also used to determine the first preamble.

[0047] In one possible design, the first preamble corresponds one-to-one with the first identifier;

[0048] The first preamble, associated with the first identifier and the current time unit, satisfies the following formula:

[0049] in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

[0050] In one possible design, the sequence of the first preamble satisfies the following formula:

[0051] Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

[0052] In one possible design, the data format of the access request indicates the SSB index corresponding to the first cell.

[0053] In one possible design, the transceiver unit is further configured to: acquire the time-frequency resources, which are used by the terminal device to access cells in the first cell set; and send the access request through the time-frequency resources.

[0054] Sixthly, at least one embodiment of this application also provides a communication device disposed in a terminal device. In one possible design, the communication device may include modules, units, or means corresponding to each of the methods / operations / steps / actions described in the second aspect. These modules, units, or means may be hardware circuits, software, or a combination of hardware circuits and software. The operations performed by this communication device and its beneficial effects can be found in the methods and beneficial effects described in the second aspect above.

[0055] In one possible design, the communication device includes a processing unit and a transceiver unit. The transceiver unit is configured to transmit a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell. The transceiver unit is also configured to receive an access request for accessing the first cell. The access request is associated with a first identifier, the first identifier being used to identify a terminal device in the first cell set.

[0056] The processing unit is used for all operations other than the sending and receiving operations performed by the terminal device described in the second aspect.

[0057] In a seventh aspect, at least one embodiment of this application also provides a communication device disposed in a terminal device. In one possible design, the communication device may include modules, units, or means corresponding to each of the methods / operations / steps / actions described in the third aspect. The modules, units, or means may be hardware circuits, software, or a combination of hardware circuits and software.

[0058] In one possible design, the communication device includes: a processing unit and a transceiver unit, the transceiver unit being configured to receive a synchronization signal block (SSB) corresponding to a fourth cell; determine whether to move from a third cell to a fourth cell; or, in response to the terminal device first accessing the fourth cell, receive a first identifier, wherein the third cell is a cell outside the first cell set, the fourth cell is a cell within the first cell set, and the first identifier is used to identify the terminal device in the first cell set.

[0059] The processing unit is used for all operations other than the sending and receiving operations performed by the terminal device described in the third aspect.

[0060] In one possible design, the transceiver unit is further configured to: receive a first primary synchronization signal (PSS) corresponding to the first cell set, the first cell set including a first cell and a second cell; determine that the device is moving from the second cell to the first cell; and send an access request, the access request being used to access the first cell, the access request being associated with the first identifier.

[0061] In one possible design, the access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

[0062] In one possible design, the processing unit is also used to determine the first preamble.

[0063] In one possible design, the first preamble corresponds one-to-one with the first identifier;

[0064] The first preamble, associated with the first identifier and the current time unit, satisfies the following formula:

[0065] in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

[0066] In one possible design, the sequence of the first preamble satisfies the following formula:

[0067] Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

[0068] In one possible design, the data format of the access request indicates the SSB index corresponding to the first cell.

[0069] In one possible design, the transceiver unit is further configured to: acquire the time-frequency resources, which are used by the terminal device to access cells in the first cell set; and send the access request through the time-frequency resources.

[0070] Eighthly, at least one embodiment of this application also provides a communication device disposed in a terminal device. In one possible design, the communication device may include modules, units, or means corresponding to each of the methods / operations / steps / actions described in the fourth aspect. The modules, units, or means may be hardware circuits, software, or a combination of hardware circuits and software.

[0071] In one possible design, the communication device includes a processing unit and a transceiver unit, the transceiver unit being used to transmit a synchronization signal block (SSB) corresponding to a fourth cell; the transceiver unit is also used to transmit a first identifier, wherein the first identifier is used to identify the terminal device in the first cell set, and the fourth cell is a cell within the first cell set.

[0072] The processing unit is used for all operations other than the sending and receiving operations performed by the terminal device described in the fourth aspect.

[0073] Ninthly, the application provides a communication device comprising a memory and one or more processors. The memory stores part or all of the necessary computer programs or instructions for implementing the functions described in the first, second, third, or fourth aspects above. The one or more processors are capable of executing the computer programs or instructions, which, when executed, cause the communication device to implement the methods in any possible design or implementation of the first aspect above.

[0074] In one possible design, the communication device may further include an interface circuit, wherein the processor is used to communicate with other devices or components through the interface circuit.

[0075] In one possible design, the communication device may also include the memory.

[0076] The aforementioned communication device may be a terminal, or a communication module in a terminal, or a chip in a terminal that is responsible for communication functions, such as a modem chip (also known as a baseband chip), or a system-on-a-chip (SoC) or system-in-package (SIP) chip that includes a modem module.

[0077] In a tenth aspect, this application provides a communication system comprising: the apparatus described in the fifth aspect and the apparatus described in the sixth aspect, or comprising the apparatus described in the seventh aspect and the apparatus described in the eighth aspect.

[0078] Eleventhly, this application provides a computer-readable storage medium storing instructions or programs that, when executed on a communication device, cause the communication device to execute the methods of the first aspect, the second aspect, the third aspect, the fourth aspect, any possible implementation of the first aspect, any possible implementation of the second aspect, any possible implementation of the third aspect, or any possible implementation of the fourth aspect.

[0079] In a twelfth aspect, this application provides a computer program product comprising a computer program or instructions that, when executed on a computer, execute the method of any of the following: the first aspect, the second aspect, the third aspect, the fourth aspect, any possible implementation of the first aspect, any possible implementation of the second aspect, any possible implementation of the third aspect, or any possible implementation of the fourth aspect. Attached Figure Description

[0080] Figure 1 is a schematic diagram of the architecture of the communication system used in the embodiments of this application;

[0081] Figure 2 is a schematic diagram of a contention-based random access procedure provided in this application;

[0082] Figure 3 is a schematic flowchart of a communication method provided in an embodiment of this application;

[0083] Figure 4 is a schematic diagram of a communication method interaction provided in an embodiment of this application;

[0084] Figure 5 is a schematic diagram of another communication method interaction provided by an embodiment of this application;

[0085] Figure 6 is a schematic diagram of a communication system structure provided in an embodiment of this application;

[0086] Figure 7 is a schematic diagram of the structure of a communication device provided in an embodiment of this application; and

[0087] Figure 8 is a schematic diagram of the structure of a communication device provided in an embodiment of this application. Detailed Implementation

[0088] This application provides a communication method, apparatus, storage medium, and computer program product to improve communication efficiency. The technical solutions in this application will now be described with reference to the accompanying drawings.

[0089] The technical solution of this application can be applied to terrestrial networks (TN), non-terrestrial networks (NTN), or scenarios where NTN and TN are integrated. NTN systems can be, for example, satellite communication systems, high altitude platform station (HAPS) communication systems, global navigation satellite systems (GNSS), etc. TN systems can be, for example, 4th generation (4G) communication systems (e.g., long term evolution (LTE) systems), worldwide interoperability for microwave access (WiMAX) communication systems, 5th generation (5G) communication systems (e.g., new radio (NR) systems), and future communication network systems, etc.

[0090] To better understand the embodiments of this application, the network architecture of the embodiments of this application will be described below. Please refer to Figure 1, which is a schematic diagram of the architecture of the communication system applied in the embodiments of this application. It should be noted that Figure 1 is a possible, non-limiting system schematic diagram. As shown in Figure 1, the communication system 10 includes a radio access network (RAN) 100 and a core network (CN) 200. Optionally, the communication system 10 may also include the Internet 300. The RAN 100 includes at least one RAN node (110a and 110b in Figure 1, collectively referred to as 110) and at least one terminal (120a-120j in Figure 1, collectively referred to as 120). The RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1). The terminal 120 is connected to the RAN node 110 wirelessly. The RAN node 110 is connected to the core network 200 wirelessly or via a wired connection. The core network elements in core network 200 and RAN nodes 110 in RAN 100 can be different physical devices, or they can be the same physical device integrating core network logical functions and radio access network logical functions, or they can be a single physical device integrating some core network element functions and some RAN node 110 functions. Terminals can be interconnected with each other, and RAN nodes 110 can be interconnected with each other via wired or wireless means. Figure 1 is only a schematic diagram; this communication system may also include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in Figure 1.

[0091] RAN 100 can be a cellular system related to the 3rd Generation Partnership Project (3GPP), such as 4G, 5G mobile communication systems, or future-oriented evolution systems. RAN 100 can also be an open RAN (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. RAN 100 can also be a communication system that integrates two or more of the above systems.

[0092] RAN node 110, sometimes also referred to as radio access network equipment, access network device, RAN entity, or access node, constitutes part of the communication system and is used to help terminals achieve wireless access. Multiple RAN nodes 110 in communication system 10 can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminals 120j accessing RAN 100 through network element 120i, network element 120i is a base station; but for base station 110a, network element 120i is a terminal. RAN node 110 and terminal 120 are sometimes both referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functions, and network elements 120a-120j can be understood as communication devices with terminal functions.

[0093] In one possible scenario, RAN node 110 can be a base station (BS), an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a base station in a future mobile communication system, or an access node in a WiFi system. RAN node 110 can be a macro base station (as shown in Figure 1, 110a), a micro base station or indoor station (as shown in Figure 1, 110b), a relay node or donor node, or a radio controller in a CRAN scenario. Optionally, RAN node 110 can also be a server, a wearable device, a vehicle, or in-vehicle equipment. For example, the radio access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). All or part of the functions of RAN node 110 in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (e.g., a cloud platform). In this application, RAN node 110 can also be a logical node, logical module, or software that can implement all or part of the functions of RAN node 110.

[0094] In another possible scenario, multiple RAN nodes 110 collaborate to assist the terminal in achieving wireless access, with each RAN node 110 implementing a portion of the base station's functions. For example, a RAN node 110 can be a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. CUs and DUs can be configured separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio frequency equipment or radio frequency units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0095] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. For ease of description, this application uses CU, CU-CP, CU-UP, DU, and RU as examples. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules.

[0096] A terminal can also be called a terminal device, user equipment (UE), mobile station, mobile terminal, etc. Terminals can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, etc. Terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, wearable devices, vehicles, drones, helicopters, airplanes, ships, robots, robotic arms, smart home devices, etc. The embodiments of this application do not limit the device form of the terminal.

[0097] For ease of description, the following description uses a base station as an example of RAN node 110. Base stations and terminals can be fixed or mobile. Base stations and terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can be deployed on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of the base stations and terminals.

[0098] The roles of base stations and terminals can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile base station. For terminals 120j that access the wireless access network 100 through 120i, terminal 120i is a base station; however, for base station 110a, 120i is a terminal, meaning that 110a and 120i communicate via a wireless air interface protocol. Of course, 110a and 120i can also communicate via a base station-to-base station interface protocol. In this case, relative to 110a, 120i is also a base station. Therefore, both base stations and terminals can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be called communication devices with base station functions, and 120a-120j in Figure 1 can be called communication devices with terminal functions.

[0099] Communication between base stations and terminals, between base stations, and between terminals can be conducted using licensed spectrum, unlicensed spectrum, or both simultaneously. Communication can be conducted using spectrum below 6 GHz, spectrum above 6 GHz, or both simultaneously. The embodiments of this application do not limit the spectrum resources used for wireless communication.

[0100] In the embodiments of this application, the functions of the base station can be executed by modules (such as chips) within the base station, or by a control subsystem that includes base station functions. This control subsystem, including base station functions, can be a control center in the aforementioned application scenarios such as smart grids, industrial control, intelligent transportation, and smart cities. Similarly, the functions of the terminal can be executed by modules (such as chips or modems) within the terminal, or by a device that includes terminal functions.

[0101] To facilitate understanding of the relevant content of the embodiments of this application, some terms and processes involved in the embodiments of this application will be explained below. This part is only for the purpose of understanding and should not be regarded as a disclosure or specific limitation of the technical solution of this application.

[0102] 1. Cell

[0103] A cell is a continuous coverage area that transmits carriers within a specific frequency range. The center frequency of the carrier corresponding to the cell is the center frequency of the cell. Cells are typically hexagonal in shape. Adjacent cells need to use different frequencies to avoid inter-cell interference, while cells that are far apart can use the same frequency to complete different data transmissions.

[0104] Taking 5G as an example, in actual cell configuration, the center frequency point number of the cell is determined first, and then the SSB frequency domain position is determined. The frequency interval between the SSB frequency domain position and the first resource block (RB) of the cell is an integer multiple of the subcarrier interval.

[0105] 2. Initial Access

[0106] The UE needs to search for a network serving it and then access the network to achieve initial access, which involves cell search and selection, and random access. These two processes are the basis for the interaction between the UE and the base station. Through these two processes, the UE completes network access and realizes wireless communication.

[0107] Cell search is the process by which the UE and the cell achieve downlink synchronization (including time and frequency synchronization) and detect the cell identifier (ID). After the cell search is complete, the UE selects the cell with the best signal to camp on. When the UE powers on, the first signal it receives is the SSB, which includes the PSS and SSS from the cell. The UE synchronizes with the cell based on the PSS and SSS in the SSB, thereby achieving downlink synchronization with the cell.

[0108] After the UE selects a cell to camp on, it will initiate a random access procedure in the current cell. The main purpose of the random access design is to enable the UE to achieve uplink synchronization with the cell and to obtain uplink transmission time advance (TA). When establishing the initial radio link (i.e., when the UE transitions from idle state to connected state), the UE can obtain the user identifier, namely the Cell Radio Network Temporary Identifier (C-RNTI), through the random access procedure.

[0109] 3. Random access (RA)

[0110] During the Random Access Request (RA) process, the UE needs to initiate access on a specific physical random access channel (PRACH) time-frequency resource. This specific PRACH time-frequency resource corresponds to the current cell. The signal transmitted by the UE when initiating access is called the Random Access Preamble (RA). The RA preamble is used to inform the base station that there is a random access request, enabling the base station to estimate the transmission delay between itself and the UE.

[0111] RA has two different mechanisms: competition-based and non-competition-based.

[0112] Mechanism 1: Competition-based RA

[0113] During this Access Resolve (RA) process, the preamble is randomly selected by the UE within the broadcast range; these preambles are random. In this case, different UEs may choose conflicting preambles, and the base station needs to resolve access for different UEs through contention, the result of which is random. It should be noted that during initial access, the UE uses contention-based RA.

[0114] Mechanism 2: Non-competitive RA

[0115] During this RA process, preambles are allocated to the UE by the base station, and these preambles are dedicated. In this case, the UE will not experience preamble conflicts, but when dedicated preambles are insufficient, the base station will instruct the UE to initiate a contention-based RA.

[0116] 4. Competition-based RA

[0117] Figure 2 is a schematic diagram of a contention-based random access procedure according to this application. As shown in Figure 2, the procedure includes steps S201 to S204:

[0118] Step S201: The UE sends an RA preamble, i.e., message (Msg) 1, so that the network device is aware of the UE's random access request and estimates the uplink time difference based on the reception of the RA preamble. Since each SSB corresponds to a different preamble index, the UE selects an SSB before selecting the RA preamble, and then determines the RA preamble based on the SSB. The network device can be, for example, a base station.

[0119] Step S202: The network device sends an RA response, i.e., Msg2. After receiving the RA preamble from the UE, the network device obtains the UE's uplink timing offset TA based on the RA preamble. The network device sends an RA response via Msg2, indicating that it has received the preamble, and carries the value of TA to the UE via Msg2 to adjust the UE's transmission timing.

[0120] Step S203: The UE obtains uplink synchronization and can transmit messages (i.e., Msg3). Msg3 carries the UE's unique identifier (UE ID), which is used for conflict resolution to distinguish UEs that send conflicting messages.

[0121] If the UE has previously connected to a cell, it uses the cell's C-RNTI as its ID, which is a unique UE ID within that cell; otherwise, the UE uses an identifier from the core network.

[0122] Step S204: The network device sends a contention resolution message, namely Msg4, to the UE.

[0123] After the UE sends Msg3, it starts a contention resolution timer. The network device assists the UE in contention resolution by using C-RNTI or UE Contention Resolution Identity.

[0124] 5. Non-competitive RA

[0125] The biggest difference between contention-based RA and non-contention-based RA is that the access preamble is allocated by the base station, thus reducing the contention resolution process; other procedures are the same as contention-based RA. In this case, the UE will not experience preamble conflicts, but when dedicated preambles are insufficient, the base station will instruct the UE to initiate contention-based RA.

[0126] The current dedicated preamble uses a cyclic shift of the time-domain mapped ZC (Zadoff-Chu) root sequence. For a time-domain Zadoff-Chu sequence with a cyclic shift index of v, the discrete-time signal satisfies the following formula:

[0127] Where the root sequence number u∈{1,2,…,N-1}, v represents the cyclic shift index, and Δ T This indicates the maximum round-trip time.

[0128] During terminal communication, the terminal may move from one cell to another, or from one area to another, causing the terminal to switch the beam used by the access network. Alternatively, due to the impact of communication quality, the terminal may need to switch the beam used by the access network. Cell movement or beam switching may cause the terminal to complete the initial access again and repeat the contention-based RA process described above. In scenarios with frequent handovers, the existing RA process has high energy consumption and long latency, resulting in a poor user experience.

[0129] To address the aforementioned problems and improve communication efficiency, at least one embodiment of this application provides a communication method.

[0130] The method provided in this application will now be described with reference to the accompanying drawings. It will be understood that in this application, terminal devices and / or network devices may perform some or all of the steps described herein. These steps are merely examples, and this application may also perform other steps or variations thereof. Furthermore, the steps may be performed in different orders as presented in this application, and it is not necessary to perform all the steps described herein.

[0131] It is understood that the methods described below in this application use terminal devices and network devices as examples to illustrate the interaction, but this application does not limit the execution subject of the interaction. For example, the terminal device in the methods provided in the embodiments of this application may also be a chip, chip system, or processor that supports the implementation of the method on the terminal device, or it may be a logical node, logical module, or software that can implement all or part of the functions of the terminal device; the network device in the methods provided below in this application may also be a chip, chip system, or processor that supports the implementation of the method on the network device, or it may be a logical node, logical module, or software that can implement all or part of the functions of the network device.

[0132] Figure 3 illustrates a flowchart of a communication method provided in at least one embodiment of this application. As shown in Figure 3, this embodiment divides the UE access to the network process into meta-access and dedicated access. It should be noted that meta-access is the access procedure initiated when a terminal first accesses a dedicated transmission area or moves from one dedicated transmission area to another. Dedicated access is the procedure initiated when a terminal device performs a handover within a dedicated transmission area. After completing meta-access, movement within the dedicated transmission area triggers dedicated access. For example, dedicated access 1 represents dedicated access initiated when the terminal device moves from cell 1 to cell 2, and dedicated access n represents dedicated access initiated when the terminal device moves from cell n to cell n+1, where n is an integer greater than 0, and cells 1 to n+1 are within the dedicated transmission area.

[0133] For example, a dedicated transmission area may be a set of multiple cells as described above, where the cells may be geographically identical or adjacent. In this case, dedicated access is the process initiated when a handover occurs between cells in the set.

[0134] For example, a dedicated transmission area can be a collection of multiple sub-regions, which can be fixed relative to the Earth, or understood as a geographical area fixed relative to the Earth. For example, a sub-region can have at least one of the following attributes: shape, outline, size, radius, area, geographical location, etc. Furthermore, a "sub-region" can also have an altitude attribute, meaning a sub-region can be understood as a geographical area at a given altitude or altitude range. For example, the shape of a sub-region can be defined by a protocol or by a network device. Sub-region shapes defined by different network devices can be the same or different. The same network device can also define multiple sub-region shapes. Similarly, the size, radius, and area of ​​a sub-region can be defined by a protocol or by a network device. Sub-region sizes, radii, and areas defined by different network devices can be the same or different. The same network device can also define multiple sub-region sizes, multiple sub-region radii, or multiple sub-region areas. For example, for a Geostationary Orbit (GEO) satellite, the projection of one beam of the GEO satellite onto the ground can be considered as a sub-region. Since GEO satellites are stationary relative to the Earth, the projection of the GEO satellite's beam onto the ground can be considered fixed relative to the Earth. In this case, the dedicated transmission area is the process initiated when moving between sub-regions within the set.

[0135] Figures 4 and 5 are schematic diagrams of a communication method interaction provided in at least one embodiment of this application. The meta-access and dedicated access in this application will be described in detail below with reference to Figures 4 and 5.

[0136] As shown in Figure 4, the meta-access process in this application includes steps S400 to S405, as follows:

[0137] Step S400: The network device sends a synchronization signal block SSB1 corresponding to cell 1 to the terminal device. Correspondingly, the terminal device receives the SSB1 from the network device. SSB1 includes PSS1 and SSS1 from cell 1. The UE synchronizes according to PSS1 and SSS1, thereby achieving downlink synchronization with the cell.

[0138] In this embodiment of the application, cell 1 is an element within a first cell set. The first cell set can be, for example, the dedicated transmission area described above. That is, cell 1 can be a cell as described above, or a sub-region as described above.

[0139] It should be noted that the term "first cell set" is merely an example of a name; it may also be referred to as "first area set," "first beam set," etc. This application does not impose any restrictions on this terminology.

[0140] Before step S400, the terminal device is in an unconnected state, that is, the terminal device first accesses cell 1; or, the terminal device accesses cell 0, which is a cell outside the first cell set. When it is determined that the terminal moves from cell 0 to cell 1, step S400 is executed.

[0141] Step S401: The terminal device sends RA preamble 1 to the network device, and the network device receives the Preamble 1 from the terminal device.

[0142] Step S402: The network device sends an RA response to the terminal device. The RA response includes TA1 corresponding to the communication between the terminal and cell 1. Correspondingly, the terminal device receives the RA response from the network device.

[0143] Step S403: The terminal device sends its ID1 to the network device, and the network device receives the ID1 from the terminal device.

[0144] Step S404: The network device sends a contention resolution message to the terminal device, and the terminal device receives the contention resolution message from the network device.

[0145] For a detailed description of the relevant parameters, information or processes in steps S401 to S404 above, please refer to steps S201 to S204 as described above. This application will not repeat them here.

[0146] Step S405: The network device sends ID2 (shown as a dedicated terminal identifier in the figure) to the terminal device. ID2 is used to identify the terminal device in the first cell set. Correspondingly, the terminal device receives ID2 from the network device.

[0147] It should be noted that ID1 is the terminal identification code carried by the terminal device itself, which is the terminal device's own identifier or an identifier determined by the terminal device. ID2 is a dedicated identifier assigned to the terminal device by the network device. The dedicated identifier is unique in the first cell set, and different terminal devices have different dedicated identifiers in the same first cell set.

[0148] In this application, a terminal determines whether to move from one cell to another by judging the beam received by the terminal. Taking the terminal moving from cell 0 to cell 1 as an example, the beam corresponding to cell 0 is beam 0, and the beam corresponding to cell 1 is beam 1. When the power of beam 1 received by the terminal or the power of beam 1 detected by the terminal is greater than a first threshold, the terminal moves to cell 1. When the power of beam 0 received by the terminal or the power of beam 0 detected by the terminal is less than a second threshold, the terminal moves out of cell 0. The size of the first threshold and the second threshold can be predefined by the protocol or set by other means. Alternatively, the terminal can determine whether to move from cell 0 to cell 1 by geographical location information. For example, the terminal moves from the geographical location range corresponding to cell 0 to the geographical location range corresponding to cell 1, or moves from the geographical location range corresponding to cell 0 to the intersection of the geographical location ranges of cell 0 and cell 1. Alternatively, the terminal can determine whether to move from cell 0 to cell 1 by signaling. It should be noted that the above methods of determining whether to move from one cell to another are merely examples and should not be regarded as limitations on this application.

[0149] In one possible implementation, the network device can also configure dedicated PRACH time and frequency resources for the terminal device. That is, the terminal obtains dedicated PRACH time and frequency resources, and the dedicated PRACH time and frequency resources correspond to the first cell set. That is, the terminal realizes data transmission with cell 1 through the dedicated PRACH time and frequency resources. The dedicated PRACH time and frequency resources are also used for the terminal device to access cells or sub-areas in the first cell set.

[0150] In one possible implementation, the network device can also configure a dedicated RA preamble (or Preamble2) for the terminal device, or the terminal device can determine the dedicated RA preamble code based on ID2, and the ID of the dedicated RA preamble code is unique within the dedicated transmission area.

[0151] For example, the network device sends the ID of the dedicated RA preamble to the terminal device through RRC signaling, and does not hop frequencies over time. Each terminal device's dedicated RA preamble is one-to-one with ID2, that is, the dedicated RA preamble is associated with ID2.

[0152] For example, the terminal device or network device determines the ID of the dedicated RA preamble based on ID2, specifically satisfying the following formula:

[0153] in, This is a special identifier preceding the RA (Rapid Recognition) designation. ID2 The timeslot number corresponding to the current time. The number of dedicated RA leaders associated with the first cell set.

[0154] In the initial stage of meta-access, the terminal obtains the initial timeslot number based on SSB1, and determines the timeslot number corresponding to the current time based on the initial timeslot number. For example, the terminal obtains the initial timeslot number of SSB1 as 1, and the timeslot number corresponding to the current time after 10 timeslots is 11. At this time, the ID of the dedicated RA preamble will hop frequency with time, that is, the dedicated RA preamble is associated with ID2 and the current time unit, which can avoid conflicts between dedicated RAs in different dedicated transmission areas. It can be uniquely identified based on ID2, without the need for RRC signaling to indicate the dedicated RA preamble ID, thus reducing data transmission costs.

[0155] As mentioned earlier, the current dedicated preamble uses a cyclic shift of the ZC root sequence mapped in the time domain. Since the capacity of the Zadoff-Chu sequence is proportional to the square of the sequence length, in mobile scenarios, the cyclic shift of the restricted set is used to counteract Doppler frequency shift, supporting no more than ±2 subcarrier frequency offsets. The capacity of the restricted set cyclic shift is limited. When the number of terminals accessing the first cell set is too large, using the cyclic shift of the ZC root sequence to generate a dedicated RA preamble will result in the number of dedicated RA preambles supported by the first cell set not being able to meet the number of accessing terminals.

[0156] At least one embodiment of this application provides a method for generating a dedicated RA preamble to solve the problem that the number of dedicated RA preambles supported by a first cell set cannot meet the number of access terminals. The method specifically satisfies the following formula:

[0157] Among them, s λ,k,l (n) is a dedicated RA preamble sequence, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F Let λ be the maximum Doppler frequency shift corresponding to the first cell set, k be the index of the cubic term coefficient indicating the first cell set, l be the index of the quadratic term coefficient indicating the terminal device, and l be the index of the linear term coefficient indicating the terminal device. That is, λ is used to distinguish different first cell sets, k and l are used to distinguish different terminal devices in the same first cell set, and N is the sequence length of the dedicated RA preamble. N can be a prime number, for example, N∈{839,139,1151,571}. This indicates rounding up to the nearest integer.

[0158] When the network device generates the dedicated RA preamble, the cubic coefficient index λ of the W sequence is determined based on the dedicated transmission area ID, and the quadratic coefficient index k and linear coefficient index l of the sequence are determined based on the dedicated RA preamble ID of the dedicated UE. The cubic coefficient index λ∈{1,2,…,N-1}, and the quadratic coefficient index l… Index of coefficients of the first term Maximum support within the first small cluster A dedicated RA preamble. For example, if N = 839, Δ T =10,Δ F =1, then 65,536 dedicated random access preambles can be supported within the dedicated transmission area.

[0159] The process of dedicated access in this application will be described in detail below with reference to Figure 5.

[0160] As shown in Figure 5, the dedicated access process in this application includes steps S501 to S503, as follows:

[0161] Step S501: The terminal device receives the first primary synchronization signal PSS2 corresponding to the first cell set from the network device. Correspondingly, the network device sends PSS2 to the terminal device.

[0162] In one possible implementation, after the terminal device accesses a cell or sub-area in the first cell set, it moves within the first cell set, for example, from cell 2 to cell 3 (i.e., the first cell set includes cell 2 and cell 3). Cell 2 and cell 3 can be cells or sub-areas as described above. At this time, the terminal device initiates a dedicated access procedure. The SSB2 corresponding to PSS2 can be a dedicated synchronization signal block of the first cell set. After receiving PSS2, the terminal device completes the synchronization timing to achieve downlink synchronization.

[0163] Step S502: The terminal device sends an access request to the network device, and the network device receives the access request from the terminal device.

[0164] For example, the access request may include the terminal device's ID2 and / or Premble2, meaning the access request is associated with ID2, and the access request is used to request access to cell 3. For instance, the terminal device sends ID2 to the network device, and the network device can determine the terminal device's Premble2 based on ID2; or, for another example, the terminal device's ID2 may be the same as its Premble2.

[0165] For example, the terminal device can send an access request through the dedicated PRACH time-frequency resources described above.

[0166] For example, the data format of the access request indicates the SSB index corresponding to cell 3, or other reference signal indexes, such as CSI-RS. Taking the SSB index as an example, the SSB index corresponding to cell 3 indicates the subcarrier spacing status. For example, the access request may include four data formats, including Format 0, Format 1, Format 2, and Format 3. Format 0 is suitable for cases with normal SSB coverage and a subcarrier spacing of 1.25 kHz; Format 1 is suitable for cases with a large SSB coverage radius and a subcarrier spacing of 1.25 kHz; Format 2 is suitable for cases with high SSB path loss and a subcarrier spacing of 1.25 kHz; and Format 3 is suitable for cases with a small SSB coverage radius and high timing resolution and a subcarrier spacing of 5 kHz.

[0167] Step S503: The network device sends an RA response to the terminal device. The RA response includes TA2 corresponding to the communication between the terminal and cell 3. The terminal device receives the RA response from the network device and completes uplink synchronization.

[0168] Using the above method, when a terminal device moves within the first cell set, it only needs to receive a dedicated PSS for lightweight downlink synchronization, and then obtain the TA in one step using a dedicated RA preamble to achieve uplink synchronization. This improves communication efficiency and avoids conflicts when multiple terminals access the network. Furthermore, cells or sub-areas within the first cell set share the same dedicated RA preamble resource, avoiding the need to configure the RA preamble every time the terminal moves, thus preventing waste of communication resources and improving communication efficiency.

[0169] It should be noted that the above embodiments can be combined to implement the combined solution. Optionally, some operations in the process of each method embodiment can be arbitrarily combined, and / or the order of some operations can be arbitrarily changed. Furthermore, the execution order between the steps of each process is merely exemplary and does not constitute a limitation on the execution order between steps; other execution orders are also possible. It is not intended to indicate that the execution order is the only possible order in which these operations can be performed. Those skilled in the art will conceive of various ways to reorder the operations described herein. In addition, it should be pointed out that the process details involved in a certain embodiment of this document are also applicable to other embodiments in a similar manner, or different embodiments can be combined.

[0170] Figure 6 is a schematic diagram of a communication system structure provided in at least one embodiment of this application. As shown in Figure 6, the communication system 60 includes a terminal device 61 and a network device 62, wherein the terminal device 61 is configured to perform the terminal device function in any of the communication methods described above.

[0171] Network device 62 is configured to perform network device functions in any of the communication methods described above.

[0172] Figure 7 is a schematic diagram of another communication device provided in this application. This communication device can be used to implement any possible function in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.

[0173] As shown in Figure 7, the communication device 700 includes a processing unit 710.

[0174] In one possible implementation, the communication device 700 may also include a transceiver unit 720.

[0175] In one possible implementation, the communication device 700 may also include a storage unit 730.

[0176] In one possible implementation, the communication device 700 may further include a transceiver unit 720 and a storage unit 730.

[0177] The communication device 700 is used to implement the functions of the terminal device in the above method embodiments.

[0178] In one possible implementation, the transceiver unit 720 is configured to receive a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell. The transceiver unit 720 is further configured to determine that it has moved from the second cell to the first cell and send an access request. The access request is used to access the first cell, and the access request is associated with a first identifier, which is used to identify the terminal device in the first cell set. The processing unit 710 is configured to perform all operations other than the processing and transceiver operations performed by the terminal device in the embodiments described above. The storage unit 730 is configured to store any data, computer instructions, and / or computer programs that may be involved in the embodiments of this application. A more detailed description of the processing unit 710 and the transceiver unit 720 can be found in the relevant descriptions in the method embodiments shown in Figures 4 and 5.

[0179] In one possible design, the transceiver unit 720 is further configured to: receive the synchronization signal block SSB corresponding to the fourth cell;

[0180] In one possible design, the transceiver unit 720 is further configured to: receive the first identifier, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell within the first cell set.

[0181] In one possible design, the access request includes the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and the current time unit.

[0182] In one possible design, the processing unit 710 is also used to determine the first preamble.

[0183] In one possible design, the first preamble corresponds one-to-one with the first identifier;

[0184] The first preamble, associated with the first identifier and the current time unit, satisfies the following formula:

[0185] in, This is the identifier for the first preamble. For the first identifier, The timeslot number corresponding to the current time. The number of the first preambles associated with the first cell set.

[0186] In one possible design, the sequence of the first preamble satisfies the following formula:

[0187] Among them, s λ,k,l (n) is the sequence of the first preamble, Δ T Δ is the maximum round-trip delay corresponding to the first cell set. F The maximum Doppler frequency shift corresponding to the first cell set is λ, where λ is the index of the cubic term coefficient of the first cell set, k is the index of the quadratic term coefficient of the terminal device, l is the index of the linear term coefficient of the terminal device, and N is the sequence length of the sequence.

[0188] In one possible design, the data format of the access request indicates the SSB index corresponding to the first cell.

[0189] In one possible design, the transceiver unit 720 is further configured to: acquire the time-frequency resources, which are used by the terminal device to access cells in the first cell set; and send the access request through the time-frequency resources.

[0190] The communication device 700 is used to implement the functions of the network device in the above method embodiments.

[0191] In one possible implementation, the transceiver unit is used to transmit a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set including a first cell and a second cell; the transceiver unit is also used to receive an access request for accessing the first cell, the access request being associated with a first identifier, the first identifier being used to identify the terminal device in the first cell set. The terminal device processing unit 710 is used to perform all operations other than the processing and transceiver operations performed by the network device in the embodiments described above. The storage unit 730 is used to store any data, computer instructions, and / or computer programs that may be involved in the embodiments of this application. A more detailed description of the above processing unit 710 and transceiver unit 720 can be found in the relevant descriptions in the method embodiments shown in Figures 4 and 5.

[0192] In one possible design, the transceiver unit is also used to: transmit a synchronization signal block (SSB) corresponding to the fourth cell;

[0193] Optionally, the transceiver unit 720 may be a transceiver, which may include an antenna and radio frequency circuitry, etc.

[0194] The processing unit 710 may be a processor (or processing circuitry), such as a baseband processor, which may include one or more CPUs.

[0195] Figure 8 is a schematic diagram of a communication device provided in this application. This communication device can be used to implement any possible function in the above method embodiments, and therefore can also achieve the beneficial effects of the above method embodiments.

[0196] As shown in Figure 8, the communication device 800 includes at least one processor 810. In one possible implementation, the communication device 800 may further include interface circuitry 820.

[0197] In one possible implementation, the communication device 800 may also include a memory 830.

[0198] In one possible implementation, the communication device 800 may also include a memory 830 and an interface circuit 820.

[0199] In some embodiments, the processor 810 and the memory 830 are coupled to each other; and / or, the processor 810 and the interface circuit 820 are coupled to each other. It is understood that the interface circuit 820 can be a transceiver or an input / output interface. The memory 830 can be used to store computer instructions executed by the processor 810, or to store input data required by the processor 810 to execute computer instructions, or to store data generated by the processor 810 after executing computer instructions.

[0200] The communication device shown in Figures 7 and 8 is only an example, and in actual applications, the communication device may have more or fewer components than shown in Figures 7 and 8, may combine two or more components, or may have different component configurations. In Figures 7 and 8, the processing unit may also be called a processing module or processor; the transceiver unit may also be called a transceiver module or transceiver; and the storage unit may also be called a storage module or memory.

[0201] It is understood that the processor in the embodiments of this application can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor can be a microprocessor or any conventional processor.

[0202] The method steps in this application embodiment can be implemented in hardware or in software instructions executable by a processor. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. The storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Alternatively, the ASIC can reside in a network device or terminal. The processor and storage medium can also exist as discrete components in a network device or terminal.

[0203] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both types of storage media.

[0204] In the various embodiments of this application, unless otherwise specified or logically conflicting, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0205] It is understood that the various numerical designations used in the embodiments of this application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of this application. The order of the process numbers described above does not imply the order of execution; the execution order of each process should be determined by its function and internal logic.

[0206] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates an "or" relationship between the preceding and following related objects; in the formulas of this application, the character " / " indicates a "division" relationship between the preceding and following related objects. "Including at least one of A, B, and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B, and C.

Claims

1. A communication method applied to a terminal device, characterized in that, The method comprises: receiving a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set comprising a first cell and a second cell; determining to move from the second cell to the first cell, and sending an access request, the access request being used for accessing the first cell, the access request being associated with a first identifier, the first identifier being used for identifying the terminal device in the first cell set.

2. The method of claim 1, wherein, determining that the terminal device moves from a third cell to a fourth cell, or, in response to the terminal device first accessing a cell being the fourth cell, the method further comprises: receiving the first identifier, wherein the third cell is a cell outside the first cell set, and the fourth cell is a cell inside the first cell set.

3. The method of claim 2, wherein, The access request comprises the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

4. The method of claim 3, wherein, The method further comprises: determining the first preamble.

5. The method of claim 3, wherein, The first preamble is associated with the first identifier, comprising that the first preamble is one-to-one corresponding to the first identifier. The first preamble is associated with the first identifier and a current time unit, and satisfies the following formula: wherein an identity of the first preamble, for the first identity, a slot number corresponding to the current time, The number of the first preambles associated with the first cell set.

6. The method of claim 5, wherein, The sequence of the first preamble satisfies the following formula: wherein s λ,k,l (n) is a sequence of a first preamble, Δ T is a maximum round trip delay corresponding to the first cell set, Δ F is a maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

7. The method of claim 1, wherein, The data format of the access request indicates a synchronization signal block (SSB) index corresponding to the first cell.

8. The method according to any one of claims 1 to 7, characterized in that, The method further comprises: acquiring a time-frequency resource, the time-frequency resource being used for the terminal device to access a cell in the first cell set. The sending of the access request comprises: sending the access request through the time-frequency resource. 9.A communication method applied to a network device, the method comprising: The method comprises: sending a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set comprising a first cell and a second cell; receiving an access request, the access request being used for accessing the first cell, the access request being associated with a first identifier, the first identifier being used for identifying a terminal device in the first cell set.

10. A communication method applied to a terminal device, comprising: The method comprises: receiving a synchronization signal block (SSB) corresponding to a fourth cell; determining to move from a third cell to the fourth cell, or, in response to the terminal device first accessing a cell being the fourth cell, receiving a first identifier, wherein the third cell is a cell outside the first cell set, the fourth cell is a cell inside the first cell set, and the first identifier is used for identifying the terminal device in the first cell set.

11. The method of claim 10, wherein, The method further comprises: receiving a first primary synchronization signal (PSS) corresponding to a first cell set, the first cell set comprising a first cell and a second cell; determining to move from the second cell to the first cell, and sending an access request, the access request being used for accessing the first cell, the access request being associated with the first identifier.

12. The method of claim 11, wherein, The access request comprises the first identifier and / or a first preamble; the first preamble is associated with the first identifier, or the first preamble is associated with the first identifier and a current time unit.

13. The method of claim 12, wherein, The method further comprises: determining the first preamble.

14. The method of claim 12, wherein, The first preamble is associated with the first identifier, comprising that the first preamble is one-to-one corresponding to the first identifier. The first preamble is associated with the first identifier and a current time unit, and satisfies the following formula: wherein an identity of the first preamble, for the first identity, a slot number corresponding to the current time, a first number of preambles associated with the first set of cells.

15. The method of claim 5, wherein, The sequence of the first preamble satisfies the following formula: wherein s λ,k,l (n) is a sequence of the first preamble, Δ T is a maximum round trip delay corresponding to the first cell set, Δ F is a maximum Doppler shift corresponding to the first cell set, λ is a cubic term coefficient index indicating the first cell set, k is a quadratic term coefficient index indicating the terminal device, l is a linear term coefficient index indicating the terminal device, and N is a sequence length of the sequence.

16. The method of claim 10, wherein, a data format of the access request indicates a synchronization signal block, SSB, index corresponding to the first cell.

17. The method of any one of claims 10-16, wherein, The method further includes: obtaining a time-frequency resource, the time-frequency resource being used for the terminal device to access a cell in the first set of cells. The sending of the access request includes: The sending of the access request includes:

18. A communication method applied to a network device, comprising: The method includes: sending a synchronization signal block, SSB, corresponding to a fourth cell; sending a first identifier, wherein the first identifier is used to identify the terminal device in the first set of cells, and the fourth cell is a cell in the first set of cells.

19. A communications device, characterized by The apparatus is configured to perform the method of any one of claims 1-9, or to perform the method of claim 10, or to perform the method of any one of claims 11-17, or to perform the method of claim 18. The apparatus includes:

20. A communications device, characterized by at least one processor configured to invoke computer instructions in a memory to cause the communication apparatus to perform the method of any one of claims 1-9, or to perform the method of claim 10, or to perform the method of any one of claims 11-17, or to perform the method of claim 18. The computer-readable storage medium has stored therein instructions or programs that, when executed on a communication apparatus, implement the method of any one of claims 1-9, or implement the method of claim 10, or implement the method of any one of claims 11-17, or implement the method of claim 18.

21. A computer-readable storage medium, characterized in that, The computer program product includes a computer program or instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1-9, or implement the method of claim 10, or implement the method of any one of claims 11-17, or implement the method of claim 18.

22. A computer program product, characterised in that, ​

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